Английская Википедия:Gull Wing Bridge

Содержание

Текст

Текст

Текст

Текст

Текст

Текст

Текст

Текст

Текст

Шаблон:Short description Шаблон:Use British English Шаблон:Use dmy dates Шаблон:Infobox bridge Gull Wing Bridge is a road bridge being built to span Lake Lothing in the town of Lowestoft, Suffolk, England, which is claimed to be (once completed) the largest rolling bascule bridge in the world lifted using hydraulic cylinders. The bridge is planned to be completed and open to traffic in early 2024.

The bridge will be higher than the existing bascule bridge at the harbour mouth, and so will not need to be lifted up as often for shipping to pass underneath. The idea of a third bridge in the area was first suggested in 1918, and approval for the Lake Lothing Third Crossing was granted in 2020. It was renamed Gull Wing Bridge after a competition for names being held at local schools.

History

The lifting Bridge at the eastern end of Lake Lothing in Lowestoft, Suffolk, England, is raised several times a day to allow boats access and egress to the harbour, and the North Sea. This hampers the traffic system meaning it can take an hour to drive from the south side of town to the north side. It has been estimated that the lifting bascule bridge carries 14,000 vehicles a day. The second bridge is upstream at Oulton Broad, and is known as Mutford Bridge; the distance between the two existing bridges is Шаблон:Convert.Шаблон:Sfn A third crossing was first mooted in 1918, just after the First World War ended. A total of three moving bridges have been built at the eastern end of Lake Lothing where the water falls into the North Sea; the current bascule lifting bridge was installed in 1972.

The approval to build the £94 million Gull Wing Bridge was granted in April 2020, but by August of 2020, costs had risen to £148 million through delays, the Covid-19 pandemic, and a desire to have a contingency fund "...should any unforeseen issues arise and caters for any further complications caused by coronavirus".

Gull Wing Bridge

The preparatory works for the bridge started in January 2021, with the official groundbreaking on 22 March 2021, after an unexploded ordnance survey was undertaken in the stretch of water beneath the bridge's location. The bridge will straddle the inner harbour, and connect Denmark Road and Peto Way on the north bank, with Waveney Drive on the south bank. Originally tendered to BAM Nuttall, the contract to build the bridge fell through and was re-tendered to Farrans.

Road Access to the bridge from the south will be along the B1351 (Waveney Drive), which has access to the A1117 road in the west, and the A12 road in the east. On the northern side, the road will access the A12 road, and the A47 road, as well as the A1114 road through either Denmark Road or Peto Way. The design of the bridge includes a foot and cycle path on both sides, with a single-lane of traffic in each direction (north/south) with a maximum speed limit of 30 MPH.

Some of the piles for the bridge foundations will be up to Шаблон:Convert below ground level. The height of the bridge above high water will be Шаблон:Convert, and at the northern end will have a Шаблон:Convert clearance above the railway line into Шаблон:Rws station.Шаблон:Sfn Whilst the space between the two main spans in the water will be Шаблон:Convert, safety features fitted to the span walls will limit this to a maximum width of Шаблон:Convert.Шаблон:Sfn The Gull Wing Bridge will be at a greater height above the water level than the existing bascule bridge at the eastern end of Lake Lothing; because of this, it is hoped the bridge will not be needed to be raised as many times per day, thereby causing less disruption to traffic. The design calls for a lifting section in the middle, which will raise southwards to allow ships to pass underneath. A traffic assessment indicated that approximately 10,000 vessels will need to go past the point of the bridge (10% less than the bascule bridge at the harbour mouth), but that the bridge will only need to be raised for 25% of the traffic passing.Шаблон:Sfn

The bascule span to the bridge is the largest of its kind in the world, with the J beams being more than 50m (164ft) above the sea. The bascule span itself is 39.5m (130ft) long, 22m (72ft) wide and 35m (115ft) tall.

The name of the bridge was decided upon after a local schools competition, and pupils from Somerleyton Primary School described the style of the bascule bridge posts as looking like a gull's wings.

Construction Timeline

February 2021 - Preparation works began

April 2021 - Construction began

June 2021 - Land piling works began

July 2021 - Marine piling works began

May 2022 - Colin Law Way access road opened

September 2021 - Waveney Drive junction is closed to all traffic

August 2022 - Piling for the bridge piers complete

October 2022 - Installation of first steel deck section (Northern Approach Viaduct 1) (NAV1)

November 2022 - Formal opening of Colin Law Way

January 2023 - Completion & Reopening of Southern Approach Roundabout / Waveney Drive

March 2023 - Denmark Road closes to all traffic

Файл:Construction of Gull Wing Bridge Lowestoft.jpg

Construction of the Northern Approach

March 2023 - Control tower structure built to full height

April 2023 - Installation of steel sections for NAV2 and NAV3, completing the Northern Approach

May 2023 - Installation of Southern Approach Viaducts (SAV) 1 - 4, completing the Southern Approach

October 2023 - Completion and Reopening of Northern Approach Roundabout & Improvements to Denmark Road

March 2024 - Installation of main lifting bascule span was completed

Photo from opposite side of the water to the main bascule span, towed by two boats. It sits on the left side of the harbour by a grain silo building, close to the existing construction of the bridge.

Main bascule span arriving in harbour for installation from Netherlands

Reclassification of Roads

The new bridge will become part of the A12 road. Plans include reclassifying several other A and B roads to reflect the new primary route through the town.

• B1531 (Waveney Drive from Tom Crisp Roundabout to the new Gull Wing Southern Roundabout) will become part of the A12
• The Gull Wing Bridge and associated approach ramps will be designated part of the A12
• Peto Way will become part of the A12
• The A1117 (Peto Way & Millennium Way) will become part of the A12

Other classification changes include the A1117 (Normanston Drive, Bridge, Road and Saltwater Way) becoming part of the A146.

References

Sources

• Шаблон:Cite report
• Шаблон:Cite report

External links

• Bridge website